Are you encouraging your people to work out? I had to start by praising their "checking weight". Next came stretching, a "quick workout", etc. Their health definitely goes up if they do health related tasks.

Try this as well: have her take a nap. Place her by one of the couches/chairs. You can also try to have her go to bed. Just place her on the bed. When this happens, praise the person/child.

I have found that keeping an eye on the person's energy level is affected by keeping them fed, happy (some perfume, maybe??? truly not sure) and by having them take naps as needed. Sometimes it takes several naps.